Ali's father is the father of Ali. He was mentioned in "Lovebugs", were Ali comments that she finds her father to be embarrassing for wearing True Religion jeans, which gains the interest of Greg Glaser and he asks if Ali's father could be interested in hanging out with him.
He is briefly seen at the end of "I Fucking Hate You", when he is called to the school to pick up Ali after she is suspended for fighting with Missy Foreman-Greenwald and can be seen scolding his daughter as Missy and her own father walk past them but he can't be heard and his face is not shown either.